JP2003283460A - Multicarrier transmitter and multicarrier transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress a peak power of a multicarrier signal and also suppress deterioration in an error rate at reception and interference on the signals of another systems. <P>SOLUTION: An S/P conversion section 103 converts transmission digital data into N parallel data sequences via an error correction encoding section 101 and a digital modulation section 102. A subcarrier selection section 104 selects M parallel data sequences among the N parallel data sequences. The selected data sequences are converted into OFDM signals via an IFFT section 105-1 and a P/S conversion section 106-1, and a peak detection section 107 detects a peak. The signal outputted to an IFFT section 105-2 is similarly processed and a peak is detected. A signal selection section 108 selects one of the OFDM signals on the basis of information notified by the peak detection section 107 and outputs the selected signal. The signal is transmitted via an RF transmission section 109 and an antenna 110. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a multicarrier transmission apparatus and a multicarrier transmission method.

[0002]

2. Description of the Related Art Conventionally, as a multicarrier transmission device, there is one described in Japanese Patent Laid-Open No. 7-143098.

This conventional transmitter converts serial digital data into parallel data (digital symbols).
And by performing an inverse fast Fourier transform,
Transmission OFDM (Orthogonal Frequency Division) that is superimposed on subcarriers with different phases and continues in time series
Multiplex) Outputs a symbol signal.

[0004]

However, in the conventional multi-carrier transmitting apparatus, an extremely large peak voltage is generated with respect to the average power due to the overlapping of the sub-carriers, and the peak portion of the signal depends on the upper limit gain of the amplifier. Is removed, unnecessary radiation occurs in and out of the band,
There is a problem that it deteriorates its own characteristics and also interferes with other systems adjacent in frequency.

If a large-sized amplifier is used to prevent this, the entire device becomes large, which makes the device expensive and further increases power consumption and heat generation.

Further, in order to suppress the peak voltage, a method of setting an upper limit value of the voltage and simply cutting (peak clipping) a voltage exceeding the upper limit value is disclosed in Japanese Patent Laid-Open No. 7-143.
No. 098.

However, if the peak voltage is simply cut, the signal is distorted and the band is widened, so that the error rate at the time of reception is deteriorated (transmission characteristics are deteriorated) and the out-of-band unwanted radiation is increased. There is a problem that it interferes with signals of other systems adjacent to each other on the frequency axis.

The present invention has been made in view of the above points, and it is possible to suppress the peak power of a multi-carrier signal, and to suppress the deterioration of the error rate at the time of reception and the interference given to signals of other systems. An object is to provide a multicarrier transmission device and a multicarrier transmission method.

[0009]

A multicarrier transmission apparatus according to the present invention comprises a parallelization means for parallelizing transmission data into a plurality of parallel data series, and a plurality of data series parallelized by the parallelization means. A first selecting means for selecting a part of the data series, and multi-carrier transmission is performed using the data series selected by the first selecting means.

According to this configuration, since the number of subcarriers used is reduced for transmission, it is possible to suppress the peak power of a multicarrier signal and suppress interference with signals of other systems.

In the multicarrier transmitting apparatus of the present invention, in the above configuration, the detecting means for detecting the amplitude of the signal obtained by serially converting the plurality of data sequences parallelized by the parallelizing means, and the parallelizing means by the parallelizing means. When the amplitude of the signal obtained by serially converting the plurality of converted data sequences is equal to or greater than a predetermined threshold value, the signal obtained by serially converting the data sequence selected by the first selecting means is selected, and by the parallelizing means. When the amplitude of a signal obtained by serially converting a plurality of parallelized data sequences is less than or equal to the threshold value, second selecting means for selecting a signal obtained by serially converting the plurality of data series parallelized by the parallelizing means. , Is adopted.

According to this configuration, when a peak above the threshold is detected in the transmission signal, the signal with a reduced number of subcarriers to be used is transmitted, so that the peak power of the multicarrier signal can be suppressed depending on the situation. Can be done
It is possible to suppress interference with signals of other systems.

The multicarrier transmission apparatus of the present invention comprises a parallelization means for parallelizing transmission data into a plurality of parallel data series, and a part of the plurality of data series parallelized by the parallelization means. A first selecting means for selecting, a first converting means for performing an inverse orthogonal transform on the data sequence selected by the first selecting means, and a plurality of data sequences inversely orthogonally transformed by the first converting means for serial data sequence First serializing means for serializing into a plurality of data, second converting means for performing an inverse orthogonal transformation on all of the plurality of data sequences parallelized by the parallelizing means, and a plurality of inverse orthogonal transforming by the second converting means. Second serialization means for serializing the data series into a serial data series, detection means for detecting the amplitude of the signal output from the second serialization means, and detection means for detecting the amplitude When the width is greater than or equal to the threshold value,
A second selection that outputs the signal output from the first serialization means and selects the signal output from the second serialization means when the amplitude detected by the detection means is less than or equal to a predetermined threshold value. And a configuration including the means.

According to this configuration, when a peak above the threshold is detected in the transmission signal, the signal with a reduced number of subcarriers to be used is transmitted, so that the peak power of the multicarrier signal can be suppressed depending on the situation. Can be done
It is possible to suppress interference with signals of other systems.

In the multi-carrier transmitting apparatus of the present invention having the above-mentioned configuration, the first selecting means has a plurality of data sequences parallelized by the parallelizing means in accordance with the amplitude of the signal detected by the detecting means. Among them, the number of data series to be selected is changed.

According to this structure, the number of subcarriers to be selected is changed according to the peak size of the transmission signal, so that it is possible to prevent the number of subcarriers from being reduced more than necessary, and The effect of loss can be minimized.

In the above-mentioned configuration, the multicarrier transmission apparatus of the present invention comprises coding means for performing error correction coding on the transmission data in advance, and the parallelization means is error correction coded by the coding means. The transmission data is parallelized into a plurality of parallel data series.

According to this configuration, since the transmission data is error-correction-coded in advance, the lost data due to the reduction of the number of subcarriers can be restored, and the deterioration of the error rate at the time of reception can be suppressed. it can.

In the multicarrier transmitting apparatus of the present invention having the above-mentioned configuration, the first selecting means is different from the previous one among the plurality of data series parallelized by the parallelizing means when a retransmission request is made. Adopt a configuration that selects some data series.

According to this configuration, when a retransmission request is made, a subcarrier different from the previous one is selected, so that data lost during the previous transmission can be always transmitted at the time of retransmission, and the reception quality can be improved. it can.

In the multi-carrier transmitting apparatus of the present invention, in the above configuration, it comprises a spreading means for spreading-modulating the transmission data in advance, and the parallelizing means converts the data spread by the spreading means into a plurality of parallel data. Adopts a configuration that is parallelized in series.

According to this configuration, since the transmission data is frequency domain spread modulated in advance, the influence of data loss due to the reduction of the number of subcarriers can be mitigated by the spreading gain, and the deterioration of the error rate at the time of reception can be prevented. Can be suppressed.

The multicarrier transmission apparatus of the present invention has the above-mentioned configuration, and is provided with a spreading means for spreading the parallel data series parallelized by the parallelizing means.

According to this structure, since the transmission data is time domain spread modulated in advance, the effect of data loss due to the reduction of the number of subcarriers can be mitigated by the spreading gain, and the deterioration of the error rate at the time of reception can be prevented. Can be suppressed.

In the multi-carrier transmission apparatus of the present invention, in the above configuration, a generation means for generating an interleave pattern according to the number of retransmissions and a parallel data series parallelized using the interleave pattern generated by the generation means. And interleaving means for performing interleaving with respect to.

According to this configuration, the interleaving pattern is changed according to the number of retransmissions to interleave the transmission data, and the data is transmitted. Therefore, it is possible to recover the data loss due to the reduction in the number of subcarriers, and at the time of reception. It is possible to suppress the deterioration of the error rate.

The multicarrier transmission apparatus of the present invention has the above-mentioned configuration, wherein the orthogonal transform is a Fourier transform.

According to this structure, since the orthogonal transform is performed by the Fourier transform, it can be applied to the existing system.

A communication terminal apparatus of the present invention has a configuration including any one of the above multicarrier transmitting apparatuses.

With this configuration, it is possible to provide a communication terminal device having the same effects as the above.

The base station apparatus of the present invention has a configuration including any one of the above multi-carrier transmission apparatuses.

With this configuration, it is possible to provide a base station device having the same effects as the above.

The multicarrier transmission method of the present invention comprises a parallelization step of parallelizing transmission data into a plurality of parallel data series, and a part of the plurality of data series parallelized by the parallelization step. First to choose
A selection step, a detection step of detecting the amplitude of a signal obtained by serially converting a plurality of data series parallelized by the parallelization step, and a signal obtained by serially converting a plurality of data series parallelized by the parallelization step When the amplitude is equal to or more than a predetermined threshold value, a signal obtained by serially converting the data series selected by the first selecting step is selected, and a signal obtained by serially converting a plurality of data series parallelized by the parallelizing step is selected. When the amplitude of is less than or equal to the threshold value, a second selection step of selecting a signal obtained by serially converting a plurality of data sequences parallelized by the parallelization step is provided.

According to this method, the number of subcarriers to be used is reduced for transmission, so that the peak power of the multicarrier signal can be suppressed and the interference given to the signals of other systems can be suppressed.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION The essence of the present invention is to reduce the number of subcarriers by selecting some subcarriers and performing multicarrier transmission when a peak occurs when all subcarriers are multicarrier transmitted. It is to take measures to reduce the effect of data loss that occurs.

As a measure against this data loss, the following four types can be roughly considered. The first is a method of performing error correction coding on the transmission data in advance, and the second is a frequency domain spread modulation (Multi Carrier-Code) method on the transmission data in advance.
Division Multiple Access; MC-CDMA), the third is time domain spread modulation on transmission data in advance.
(Multi Carrier / Direct Sequence-Code Division Mul
tiple access; MC / DS-CDMA), and a fourth method is to interleave subcarriers and change the interleave pattern at the time of retransmission.

Hereinafter, embodiments of the present invention using these methods will be described in detail with reference to the drawings.

(Embodiment 1) FIG.1 is a block diagram showing an example of the configuration of a multicarrier transmitting apparatus according to Embodiment 1 of the present invention. Here, a case where an error correction code is incorporated in a transmitter using an OFDM communication system will be described as an example.

The OFDM transmitter shown in FIG. 1 comprises an error correction coding section 101, a digital modulation section 102, a serial /
Parallel conversion unit (S / P) 103, subcarrier selection unit 104, inverse fast Fourier transform (IFFT) unit 105-
1, 105-2, parallel / serial converter (P / S)
106-1, 106-2, peak detector 107, signal selector 108, RF (Radio Frequency) transmitter 109,
And an antenna 110.

The error correction coding unit 101 performs error correction coding on the transmission digital data, and then the digital modulation unit 102.
Output to.

The digital modulation section 102 uses a BPSK (Bin
ary Phase Shift Keying) and 16QAM (Quadrature A
The output of the error correction coding unit 101 is digitally modulated according to a modulation method such as mplitude modulation) and output to the S / P conversion unit 103.

The S / P converter 103 converts the output signal (digital symbol) of the digital modulator 102, which is a serial data series, into N parallel data series, and the IFFT section 10
It outputs to 5-2 and the subcarrier selection part 104.

The subcarrier selection unit 104, out of the N parallel data sequences output from the S / P conversion unit 103,
It selects M parallel data series on which important data is to be superimposed and outputs them to the IFFT unit 105-1. Here, the M lines on which important data are to be superimposed are set in advance.

IFFT section 105-1 converts the output of subcarrier selecting section 104 into each sample value in the time waveform of the OFDM signal, and outputs it to P / S converting section 106-1. Similarly, the IFFT unit 105-2 includes the S / P conversion unit 1
The output of 03 is converted into each sample value in the time waveform of the OFDM signal and output to the P / S conversion unit 106-2.

The P / S converters 106-1 and 106-2 are
OF output from the IFFT units 105-1 and 105-2
Each parallel data series corresponding to each sample value in the time waveform of the DM signal is converted into a serial data series to generate an OFDM signal.

The peak detecting section 107 includes a P / S converting section 10
The peaks of the OFDM signals output from 6-1 and 106-2 are detected and notified to the signal selection unit 108.

The signal selection unit 108 includes a peak detection unit 107.
One of the OFDM signals output from the P / S conversion units 106-1 and 106-2 is selected by the method described later based on the notification information from the above and output to the RF transmission unit 109.

RF transmitting section 109 subjects the OFDM signal output from signal selecting section 108 to predetermined radio processing such as amplification and up-conversion, and transmits it from antenna 110.

Next, the specific operations of the peak detector 107 and the signal selector 108 will be described.

The peak detecting section 107 includes a P / S converting section 10
6-1 and 106-2 respectively output OFDM
A power peak having a magnitude equal to or larger than a preset threshold value is detected from the signal and notified to the signal selection unit 108.

The signal selection unit 108 includes a peak detection unit 107.
On the basis of the information notified from the above, if no peaks equal to or greater than the preset threshold value are detected, the output of the P / S conversion unit 106-2, that is, all N subcarrier signals are used for the generation. When the selected OFDM signal is output to the RF transmission unit 109 and a peak equal to or greater than the threshold is detected only from the output of the P / S conversion unit 106-2, the output of the P / S conversion unit 106-1, that is, , An OFDM signal generated by using some subcarrier signals is selected, and the RF transmitter 1
It outputs to 09.

Here, the threshold is set to a value that is slightly smaller than the size of the peak to be subjected to peak clipping or peak suppression.

With the above configuration, when there is no peak to be subjected to peak clipping or peak suppression, an OFDM signal generated using all subcarrier signals is transmitted, and a peak to be subjected to peak clipping or peak suppression is transmitted. , The OFDM signal can be switched to be transmitted using only some of the subcarrier signals.

Normally, in an OFDM signal created using all N subcarrier signals, even if a peak to be subjected to peak clipping or peak suppression appears, the size of this peak is N subsubstrates. Since this is due to the contribution of carriers, by selecting an appropriate value for the number M of selections in the subcarrier selection unit 104 and reducing the number of subcarriers to be used to M, the size of this peak can be increased to an allowable size. It can be expected to decrease.

As a result, it is possible to prevent generation of unnecessary radiation in and out of the band due to the peak portion being cut.

It can be assumed that a peak equal to or greater than the threshold is detected in both the OFDM signal created using all N subcarrier signals and the OFDM signal created using some subcarrier signals. But in this case,
The OFDM signal with the smaller number of peaks may be selected.

FIG. 2 is a block diagram showing an example of the configuration of a receiving apparatus that receives a signal transmitted from the transmitting apparatus according to this embodiment.

The receiving apparatus shown in FIG. 2 has an antenna 201,
It has an RF reception unit 202, an S / P conversion unit 203, a fast Fourier transform (FFT) unit 204, a P / S unit 205, a digital demodulation unit 206, and an error correction decoding unit 207.

The signal received by the antenna 201 is RF
The receiving unit 202 performs predetermined wireless processing such as down-conversion, and the S / P conversion unit 203 multi-carriers,
The FFT unit 204 performs a Fourier transform, the P / S unit 205 converts it into a serial data sequence, the digital demodulation unit 206 demodulates it, and the error correction decoding unit 207 performs error correction decoding.

The influence of data loss caused by reducing the number of subcarriers used in the transmitting apparatus shown in FIG. 1 is that the transmission data is error correction coded in the error correction coding unit 101. By performing error correction in the error correction decoding unit 207 on the receiving device side, the influence of data loss can be reduced to a level at which there is no problem.

On the receiving device side, the received data can be demodulated regardless of the method used for multi-carrier transmission. Therefore, even if the configuration of the transmission device is changed due to version upgrade or the like, there is an advantage that it is not necessary to change the reception device.

As described above, according to the present embodiment, data loss caused by reducing the number of subcarriers used by multicarrier transmission using some subcarriers of the multicarrier and error correction is performed. Therefore, it is possible to suppress the peak power of the multi-carrier signal and to suppress the deterioration of the error rate at the time of reception and the interference given to signals of other systems.

Here, the subcarrier selection unit 10
In FIG. 4, the case where the number M of selected data series is fixed has been described as an example, but as shown in FIG.
In a situation where an OFDM signal created by using some subcarrier signals is selected, for example, the peak size becomes a threshold value according to the peak size of the signal detected by the peak detection unit 107. In contrast, M may be adaptively changed such that M is increased when it is significantly smaller.

(Embodiment 2) FIG.4 is a block diagram showing an example of the configuration of a multicarrier transmitting apparatus according to Embodiment 2 of the present invention. Note that this multicarrier transmission apparatus has the same basic configuration as the multicarrier transmission apparatus shown in FIG. 1, and the same components are assigned the same reference numerals and explanations thereof are omitted.

The feature of the present embodiment is that subcarrier selecting section 104 shown in FIG. 1 changes the subcarrier to be selected according to the retransmission request from the receiving apparatus.

As described above, transmission data loss occurs when the number of subcarriers is reduced to M in subcarrier selection section 104. When the reliability of the received signal is low, the receiving device requests the transmitting device to retransmit the signal. If the transmitting apparatus selects and transmits the same M subcarriers as the previous time in response to this retransmission request, the reliability of the transmission signal may not be improved even at the time of retransmission.

Therefore, in the present embodiment, in order to further reduce the effect of data loss in response to the retransmission request from the receiving device, M subcarriers different from the previous one are selected, so that the loss occurs at the first transmission. Make sure that the data is sent at the time of resending.

For example, an H-ARQ (Hybrid-Aut) that improves reception performance by combining a plurality of retransmitted signals
When used in combination with a system such as the omatic repeat request method, different subcarriers are transmitted at the time of the previous transmission and at the time of retransmission, so the amount of information in the combined case increases and the reception performance is greatly improved. Be expected.

Although a case has been described here as an example where M subcarriers different from the previous one are selected in response to a retransmission request from the receiving apparatus, the subcarriers to be selected are determined according to the number of retransmissions. It may be.

(Embodiment 3) FIG.5 is a block diagram showing an example of the configuration of a multicarrier transmitting apparatus according to Embodiment 3 of the present invention. Here, frequency domain spread modulation (MC-CDM) is applied to a transmitter using an OFDM communication system.
A case where the A) method is used will be described as an example.
This multi-carrier transmitting device has the same basic configuration as the multi-carrier transmitting device shown in FIG.
The same components are designated by the same reference numerals and the description thereof will be omitted.

The feature of this embodiment is that it has a spreading section 501 instead of the error correction coding section 101 shown in FIG.

The spreading section 501 is a digital modulation section 102.
The transmission digital data that has been digitally modulated by is subjected to frequency domain spread modulation.

The spread-modulated signal is sent to the S / P converter 10
3 is output, processed and transmitted in the same manner as the multicarrier transmitting apparatus shown in FIG.

FIG. 6 is a block diagram showing an example of the configuration of a receiving apparatus that receives a signal transmitted from the transmitting apparatus according to this embodiment. Note that this receiving device has the same basic configuration as the receiving device shown in FIG. 2, and the same components are assigned the same reference numerals and explanations thereof are omitted.

The receiving apparatus shown in FIG. 6 has the despreading unit 601.
The transmission data that has been spread and modulated by the spreading section 501 shown in FIG. 5 is received and despread.

With the above configuration, 1-bit transmission data is spread-modulated into several tens to several hundreds of chip signals and arranged on different subcarriers. Therefore, even if data is lost by reducing the number of used subcarriers to M, not all 1-bit transmission data is lost, but reception data can be restored by the spreading gain. That is, the influence of data loss can be reduced and the reception quality can be maintained.

Here, the case where the error correction coding unit 101 shown in FIG. 1 is not installed has been described as an example, but the error correction coding unit may be further installed in front of the digital modulation unit 102. good. As a result, it is possible to further reduce the influence of data loss due to the number of used subcarriers being reduced to M.

Further, here, the case where the transmission data is frequency domain spread modulated has been described as an example, but with the same configuration, spread section 501 performs spread spectrum modulation, and S / P conversion section 103 sets the subcarriers on the time axis. Subcarriers can also be spread-modulated two-dimensionally by rearranging above.

(Embodiment 4) FIG.7 is a block diagram showing an example of the configuration of a multicarrier transmitting apparatus according to Embodiment 4 of the present invention. Here, a time domain spread modulation (MC / DS-C) is applied to a transmitter using an OFDM communication system.
The case where the DMA system is used will be described as an example. Note that this multicarrier transmission apparatus has the same basic configuration as the multicarrier transmission apparatus shown in FIG. 1, and the same components are assigned the same reference numerals and explanations thereof are omitted.

The feature of this embodiment is that it has a spreading section 701 instead of the error correction coding section 101 shown in FIG.

The diffusion unit 701 is the S / P conversion unit 103 and the N
The transmission digital data parallelized to the book subcarriers is time-domain spread modulated and output to the subcarrier selection unit 104 and the IFFT unit 105-2.

Subcarrier selection section 104 and IFFT
The signal output to section 105-2 is processed and transmitted in the same manner as the multicarrier transmission apparatus shown in FIG.

FIG. 8 is a block diagram showing an example of the configuration of a receiving apparatus that receives a signal transmitted from the transmitting apparatus according to this embodiment. Note that this receiving device has the same basic configuration as the receiving device shown in FIG. 2, and the same components are assigned the same reference numerals and explanations thereof are omitted.

The receiving apparatus shown in FIG. 8 has the despreading unit 801.
The transmission data, which is spread-modulated by the spreading unit 701 shown in FIG. 7, is received and despread.

With the above configuration, 1-bit transmission data is spread-modulated into several tens to several hundreds of chip signals and arranged on different subcarriers. Therefore, even if data is lost by reducing the number of subcarriers used to M, not all 1-bit transmission data is lost, and the influence of data loss can be reduced. The reception quality can be maintained.

Here, the case where the error correction coding unit 101 shown in FIG. 1 is not installed has been described as an example, but the error correction coding unit may be further installed in front of the digital modulation unit 102. good. As a result, it is possible to further reduce the influence of data loss due to the number of used subcarriers being reduced to M.

(Embodiment 5) FIG.9 is a block diagram showing an example of the configuration of a multicarrier transmitting apparatus according to Embodiment 5 of the present invention. Here, a case will be described as an example in which subcarrier interleaving is performed on subcarriers of a transmission device using an OFDM communication system and the interleaving pattern is changed at the time of retransmission. Note that this multicarrier transmission apparatus has the same basic configuration as the multicarrier transmission apparatus shown in FIG. 1, and the same components are assigned the same reference numerals and explanations thereof are omitted.

The feature of this embodiment is that interleaving pattern generating section 901 and subcarrier interleaving section 9 are used.
Is to have 02.

Subcarrier interleaving section 902 receives S
The subcarriers output from / P conversion section 103 are interleaved and output to subcarrier selection section 104 and IFFT section 105-2.

Subcarrier selection section 104 and IFFT
The signal output to section 105-2 is processed and transmitted in the same manner as the multicarrier transmission apparatus shown in FIG.

Interleave pattern generation section 901 generates an interleave pattern used in subcarrier interleave section 902. This interleave pattern is changed depending on the number of retransmissions.

FIG. 10 is a block diagram showing an example of the configuration of a receiving apparatus that receives a signal transmitted from the transmitting apparatus according to this embodiment. Note that this receiving device has the same basic configuration as the receiving device shown in FIG. 2, and the same components are assigned the same reference numerals and explanations thereof are omitted.

The transmitting apparatus shown in FIG. 10 has interleaving pattern generating section 1001 and subcarrier deinterleaving section 1002. Interleave pattern generation section 1001 generates the same interleave pattern as interleave pattern generation section 901 shown in FIG. 9 according to the number of retransmissions, and subcarrier deinterleave section 1002.
Output to. Subcarrier deinterleave unit 1002
Performs deinterleaving of transmission data interleaved in subcarrier interleaving section 902 shown in FIG.

With the above configuration, the signal after interleaving the subcarriers of the transmission data is to be transmitted, and when there is a retransmission request from the receiving apparatus, the interleaving pattern is changed according to the number of retransmissions. Send.

Therefore, since different data is transmitted for each retransmission, it is possible to reduce the influence of data loss caused by reducing the number of used subcarriers to M, so that the reception performance is improved. be able to.

For example, when used in combination with a system such as the H-ARQ system which improves the reception performance by combining a plurality of retransmitted signals, different subcarriers are transmitted at the previous time and at the time of retransmission. Therefore, the amount of information when combined is doubled, and a great improvement in reception performance is expected.

[0097]

As described above, according to the present invention,
It is possible to suppress the peak power of the multi-carrier signal, and suppress the deterioration of the error rate at the time of reception and the interference given to the signals of other systems.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a configuration of a multicarrier transmission apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing an example of a configuration of a reception device that receives a signal transmitted from the transmission device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing an example of a configuration of a multicarrier transmission apparatus according to Embodiment 1 of the present invention.

FIG. 4 is a block diagram showing an example of a configuration of a multicarrier transmission apparatus according to Embodiment 2 of the present invention.

FIG. 5 is a block diagram showing an example of a configuration of a multicarrier transmission apparatus according to Embodiment 3 of the present invention.

FIG. 6 is a block diagram showing an example of a configuration of a reception device that receives a signal transmitted from the transmission device according to the third embodiment of the present invention.

FIG. 7 is a block diagram showing an example of a configuration of a multicarrier transmission apparatus according to Embodiment 4 of the present invention.

FIG. 8 is a block diagram showing an example of a configuration of a receiving apparatus that receives a signal transmitted from the transmitting apparatus according to Embodiment 4 of the present invention.

FIG. 9 is a block diagram showing an example of a configuration of a multicarrier transmission apparatus according to Embodiment 5 of the present invention.

FIG. 10 is a block diagram showing an example of a configuration of a receiving apparatus that receives a signal transmitted from the transmitting apparatus according to Embodiment 5 of the present invention.

[Explanation of symbols]

101 error correction coding unit 103 S / P converter 104 subcarrier selection unit 105-1 and 105-2 IFFT section 106-1, 106-2 P / S converter 107 peak detector 108 signal selector 501, 701 diffuser 901 Interleave pattern generation unit 902 subcarrier interleaving section

Claims (13)

[Claims] 1. A parallelizing means for parallelizing transmission data into a plurality of parallel data series, and a first selecting means for selecting a part of the plurality of data series parallelized by the parallelizing means. When,
A multi-carrier transmission device comprising: a multi-carrier transmission using the data sequence selected by the first selection means. 2. A detection means for detecting the amplitude of a signal obtained by serially converting a plurality of data series parallelized by the parallelization means, and a signal obtained by serially converting a plurality of data series parallelized by the parallelization means. When the amplitude of is greater than or equal to a predetermined threshold value, a signal obtained by serially converting the data series selected by the first selecting means is selected, and a plurality of data series parallelized by the parallelizing means are serially converted. When the signal amplitude is less than or equal to the threshold value, a second selection unit that selects a signal obtained by serially converting a plurality of data sequences parallelized by the parallelization unit is provided. The described multi-carrier transmission device. 3. Parallelizing means for parallelizing transmission data into a plurality of parallel data series, and first selecting means for selecting a part of the plurality of data series parallelized by the parallelizing means. A first conversion means for performing an inverse orthogonal transformation on the data sequence selected by the first selecting means; and a first series for serializing a plurality of data sequences subjected to the inverse orthogonal transformation by the first conversion means into a serial data sequence. Conversion means, second conversion means for performing an inverse orthogonal transformation on all of the plurality of data series parallelized by the parallelization means, and a plurality of data series subjected to inverse orthogonal transformation by the second conversion means into a serial data series. Second serializing means for serializing, detecting means for detecting an amplitude of a signal output from the second serializing means, and an amplitude detected by the detecting means being equal to or more than the threshold value Outputs a signal output from the first serialization means, and selects a signal output from the second serialization means when the amplitude detected by the detection means is less than or equal to a predetermined threshold value. 2. A multi-carrier transmission device comprising: two selection means. 4. The first selecting means changes the number of data series to be selected among a plurality of data series parallelized by the parallelizing means according to the amplitude of the signal detected by the detecting means. The multi-carrier transmission device according to claim 2 or 3, characterized in that. 5. An encoding unit for encoding the transmission data in advance by error correction is provided, and the parallelization unit parallelizes the transmission data error-correction encoded by the encoding unit into a plurality of parallel data sequences. The multi-carrier transmission device according to any one of claims 1 to 4, wherein 6. The first selecting means selects, when a retransmission request is made, a part of the data series parallelized by the parallelizing means, which is different from the previous data series. The multicarrier transmission device according to any one of claims 1 to 5. 7. A spreading means for spreading-modulating the transmission data in advance is provided, and the parallelizing means parallelizes the data spread by the spreading means into a plurality of parallel data sequences. The multicarrier transmission device according to any one of claims 1 to 6. 8. The multicarrier transmitting apparatus according to claim 1, further comprising a spreading unit that spreads the parallel data series parallelized by the parallelizing unit. 9. An interleaving means for generating an interleave pattern according to the number of retransmissions, and an interleaving means for interleaving a parallel data sequence parallelized using the interleave pattern generated by the generating means. The multi-carrier transmission device according to claim 1, wherein the multi-carrier transmission device comprises: 10. The multicarrier transmission apparatus according to claim 3, wherein the orthogonal transform is a Fourier transform. 11. A communication terminal apparatus comprising the multicarrier transmission apparatus according to claim 1. Description: 12. A base station apparatus comprising the multicarrier transmission apparatus according to claim 1. Description: 13. A parallelization step of parallelizing transmission data into a plurality of parallel data series, and a first selecting step of selecting a part of the data series of the plurality of data series parallelized by the parallelization step. And a detection step of detecting an amplitude of a signal obtained by serially converting a plurality of data sequences parallelized by the parallelization step, and an amplitude of a signal obtained by serially converting a plurality of data sequences parallelized by the parallelization step. When it is equal to or more than a predetermined threshold value, a signal obtained by serially converting the data sequence selected by the first selecting step is selected, and an amplitude of a signal obtained by serially converting a plurality of data sequences parallelized by the parallelizing step is selected. Is less than or equal to the threshold value, a signal obtained by serially converting a plurality of data sequences parallelized by the parallelization step is selected. A multicarrier transmission method comprising: a selecting step.